单项选择题

The U. S. has to deal with the problems arising from vehicle use because ________.

A．most Americans are reluctant to switch to public transportation systems
B．the present level of oil prices is considered unacceptable
C．other countries will protest its increasing greenhouse emissions
D．it should take a lead in conserving natural resources
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单项选择题
Which of the following is practical but only makes a marginal contribution to solving the problem of greenhouse emissions
A．The use of fuels other than gasoline.
B．Improved energy efficiency.
C．The introduction of less polluting driving systems.
D．Reducing car use by carpooling.
单项选择题
From the passage we know that the increased use of cars will ________.
A．consume half of the oil produced in the world
B．have serious consequences for the well-being of all nations
C．widen the gap between the developed and developing countries
D．impose an intolerable economic burden on residents of large cities
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